| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef _LIBCPP___ALGORITHM_RANGES_ADJACENT_FIND_H |
| #define _LIBCPP___ALGORITHM_RANGES_ADJACENT_FIND_H |
| |
| #include <__config> |
| #include <__functional/identity.h> |
| #include <__functional/invoke.h> |
| #include <__functional/ranges_operations.h> |
| #include <__iterator/concepts.h> |
| #include <__iterator/projected.h> |
| #include <__ranges/access.h> |
| #include <__ranges/concepts.h> |
| #include <__ranges/dangling.h> |
| #include <__utility/move.h> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| # pragma GCC system_header |
| #endif |
| |
| #if _LIBCPP_STD_VER >= 20 |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| namespace ranges { |
| namespace __adjacent_find { |
| struct __fn { |
| |
| template <class _Iter, class _Sent, class _Proj, class _Pred> |
| _LIBCPP_HIDE_FROM_ABI constexpr static |
| _Iter __adjacent_find_impl(_Iter __first, _Sent __last, _Pred& __pred, _Proj& __proj) { |
| if (__first == __last) |
| return __first; |
| |
| auto __i = __first; |
| while (++__i != __last) { |
| if (std::invoke(__pred, std::invoke(__proj, *__first), std::invoke(__proj, *__i))) |
| return __first; |
| __first = __i; |
| } |
| return __i; |
| } |
| |
| template <forward_iterator _Iter, sentinel_for<_Iter> _Sent, |
| class _Proj = identity, |
| indirect_binary_predicate<projected<_Iter, _Proj>, projected<_Iter, _Proj>> _Pred = ranges::equal_to> |
| _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr |
| _Iter operator()(_Iter __first, _Sent __last, _Pred __pred = {}, _Proj __proj = {}) const { |
| return __adjacent_find_impl(std::move(__first), std::move(__last), __pred, __proj); |
| } |
| |
| template <forward_range _Range, |
| class _Proj = identity, |
| indirect_binary_predicate<projected<iterator_t<_Range>, _Proj>, |
| projected<iterator_t<_Range>, _Proj>> _Pred = ranges::equal_to> |
| _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr |
| borrowed_iterator_t<_Range> operator()(_Range&& __range, _Pred __pred = {}, _Proj __proj = {}) const { |
| return __adjacent_find_impl(ranges::begin(__range), ranges::end(__range), __pred, __proj); |
| } |
| }; |
| } // namespace __adjacent_find |
| |
| inline namespace __cpo { |
| inline constexpr auto adjacent_find = __adjacent_find::__fn{}; |
| } // namespace __cpo |
| } // namespace ranges |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // _LIBCPP_STD_VER >= 20 |
| |
| #endif // _LIBCPP___ALGORITHM_RANGES_ADJACENT_FIND_H |